Grip for a writing instrument



FIG. 1 is a perspective view of a grip for a writing instrument showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a left side view thereof; and,

FIG. 7 is another perspective view thereof, shown in a state of use.

The broken lines showing a pen in FIG. 7 are included for the purpose of illustrating environment and form no part of the claimed design. 

The ornamental design for a grip for a writing instrument, as shown and described. 